• 정보화정책
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• 제28권4호
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• pp.3-18
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• 2021

'정보격차'는 공유성, 이전성 및 복제성과 같이 평등화에 기여함직한 정보의 내재적 속성에 반하는 정보화 시대의 예기치 않은 역기능으로 간주되어 학술적으로나 사회적으로 주목받아 왔다. 더구나 그것이 정보의 불균등한 분포로 그치는 것이 아니라 경제적, 사회적, 문화적 불평등과 맞물려 사회체계의 안정성을 해치는 요소가 될 수 있다는 문제의식은 정보격차에 관한 연구를 촉진시켜 왔다. 따라서 본 논문에서는 (1) 1970년 이후 국내외에서 수행된 정보격차 연구들을 총괄적으로 일람하고, (2) 상론할 가치가 높다고 판단되는 연구물들을 섭렵해 정보격차 담론의 성과와 한계를 검토한 후, (3) 정보격차 연구의 새로운 과제와 방향을 탐지하였다. 그 결과, 학계 안팎에서 의미 있는 성과가 축적되어 왔음이 확인되었으나, 순수연구와 정책연구 간의 괴리 및 시대 변화에 뒤진 '지적 지체' 현상이 한계점으로 드러났다. 아울러 지능정보화 시대에는 운용격차, 선정격차 및 증강격차가 정보격차 연구의 새로운 의제로 대두할 것임을 밝힐 수 있었다.

• 국제학술발표논문집
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• The 2th International Conference on Construction Engineering and Project Management
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• pp.186-195
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• 2007

Key Performance Indicators (KPIs) are the criteria of measuring project performance in order to attain construction excellence. Previous researchers have examined the abstract concept of success for general new construction and identified its relationship with the factors of success. In fact, most buildings exist to satisfy the needs of people. With the passing of time and change in technology, buildings have to be maintained and renovated in order to continue functioning properly for the benefits of users. Therefore, criteria and factors of success have increasingly attracted the attention of both researchers and practitioners, especially in cities where buildings become ageing. However, the topic of project success for maintenance projects is less discussed in previous research, and project participants, including maintenance surveyors should be able to identify the success measurement and its associated factors for performance improvement. This study fills the research gap by investigating the criteria and factors of success for maintenance projects. It first provides a summary of the literature review on the criteria and factors of success for construction projects. An empirical study has also been carried out with ten practitioners in Hong Kong to further identify the criteria and factors critical for the success of maintenance projects in practice. While most criteria and factors of success for new construction projects are also applicable to maintenance projects, participants in maintenance projects believe that effective communication is in particular important to provide quality service to the end-users.

• 한국환경농학회지
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• 제42권1호
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• pp.21-27
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• 2023

Pre-harvest residue limits (PHRLs) have been proposed as criteria for a proactive role to exceed the maximum residue limit (MRL) of pesticides in agricultural products at harvest. However, PHRL numbers are significantly less than those of established MRLs. This study was performed to determine the dissipation constants and residual concentrations of lufenuron after application on crown daisy and chamnamul under green house conditions. Two residue field trials for each crown daisy and chamnamul were selected to consider a different geographical site at least 20 km far from one another. The pesticide was treated according to critical GAP. After samples were sprayed with lufenuron, they were collected at 0, 1, 3, 5, 7, 10, and 14 days and analyzed using HPLC-DAD. The mean recoveries of crown daisy and chamnamul were within the range of 70-120% with below 20% coefficient variation, which is within the acceptable limits specified by the manual of pre-harvest residue study for pesticides (MFDS, 2014). The biological half-lives in field I and field II were 7.0 and 4.6 days for crown daisy and 2.7 and 2.8 days for chamnamul, respectively. The lower bounds of 95% confidence intervals of dissipation rate constants of lufenuron in crown daisy were determined to be 0.0692 and 0.1298 for field I and field II, respectively, and in chamnamul were 0.2067 for both field I and field II. After applying lufenuron 5% EC, the lufenuron residues on crown daisy and chamnamul at the pre-harvest intervals (14 days for crown daisy and 7 days for chamnamul) were below the safe levels. The dissipation rates of lufenuron in crown daisy and chamnamul were evaluated for similarities with leafy vegetables based on a 95% confidence interval.

• Smart Structures and Systems
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• 제30권5호
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• pp.479-500
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• 2022

In this study, a new type of isolation bearing is proposed by combining S-shaped steel plate dampers (SSDs) with a spherical steel bearing, and the seismic control effect of a five-span standard high-speed railway bridge is investigated. The advantages of the proposed S-shaped steel damping friction bearing (SSDFB) are that it cannot only lengthen the structural periods, dissipate the seismic energy, but also prevent bridge unseating due to the restraint effectiveness of SSDs in the large relative displacements between the girders and piers. This study first presents a detailed description and working principle of the SSDFB. Then, mechanical modeling of the SSDFB was derived to fundamentally define its cyclic behavior and obtain key mechanical parameters. The numerical model of the SSDFB's critical component SSD was verified by comparing it with the experimental results. After that, parameter studies of the dimensions and number of SSDs, the friction coefficient, and the gap length of the SSDFBs were conducted. Finally, the longitudinal seismic responses of the bridge with SSDFBs were compared with the bridge with spherical bearing and spherical bearing with strengthened shear keys. The results showed that the SSDFB can not only significantly mitigate the shear force responses and residual displacement in bridge substructures but also can effectively reduce girder displacement and prevent bridge unseating, at a cost of inelastic deformation of the SSDs, which is easy to replace. In conclusion, the SSDFB is expected to be a cost-effective option with both multi-stage energy dissipation and restraint capacity, making it particularly suitable for seismic isolation application to high-speed railway bridges.

• 한국재료학회지
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• 제33권9호
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• pp.360-366
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• 2023

This study focuses on how the partial substitution of copper by nickel nanoparticles affects the electrical and structural properties of the Bi₂Ba₂Ca₂Cu_2.9Ni_0.1O_10+δ, Bi₂Ba₂Ca₂Cu_2.8Ni_0.2O_10+δ and Bi₂Ba₂Ca₂Cu_2.6Ni_0.4O_10+δ compounds. Approximate values of crystallization size and crystallization percentage for the three compounds were calculated using the Scherer, modified Scherer, and Williamson-Hall methods. A great similarity was observed in the crystal size values from the Scherer method, 243.442 nm, and the Williamson-Hall method, 243.794 nm for the second sample. At the same time this sample exhibited the highest crystal size value for the three methods. In the examination of electrical properties, the sample with 0.1 partial substitution, Bi₂Ba₂Ca₂Cu_2.9Ni_0.1O_10+δ was determined to be the best with a critical temperature of 100 K and an energy gap of 6.57639 × 10^-21 MeV. Using the SEM technique to analyze the structural morphology of the three phases, it was discovered that the size of the granular forms exceeds 25 nm. It was determined that the samples' shapes alter when nickel concentration rises. The patterns that reveal the distribution of the crystal structure also exhibit clear homogeneity.

• 지역연구
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• 제39권4호
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• pp.19-32
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• 2023

본 연구는 괜찮은 일자리 공급의 산업 및 지역입지 특성을 규명하는데 목적을 두었다. 워크넷 Open API를 활용하여 최근 1년의 채용공고 빅데이터를 수집하고 분석한 결과, 제조업은 전체 괜찮은 일자리 공급의 중추적 역할을 하고 있는 것을 확인하였으며, 지역별로는 수도권이 전체 괜찮은 일자리의 절반 가까이를 차지하는 등 지역 간 격차가 뚜렷하게 나타났다. 대도시권 내부 괜찮은 일자리의 입지는 대도시권별로 차별적인 특성을 보였다. 일부 대도시권은 제조업에서 큰 규모의 질 좋은 일자리 공급이 있었지만 지역의 중심부보다는 주변지역에 편중된 경향이 있었다. 다른 대도시권은 중심부에서 직주근접의 질 좋은 일자리를 공급하고 있지만 그 규모가 적은 문제를 보였다. 본 연구의 결과는 질 좋은 일자리 확대를 위한 제조업에 대한 정책지원의 필요성과 더불어 수도권-비수도권 간의 일자리 질 격차 해소를 위한 정책개입을 시사한다. 또한 대도시권별 맞춤형 일자리 전략의 수립과 특히 직주 근접을 고려한 일자리 공급전략의 필요성을 강조한다.

• Journal of Veterinary Science
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• 제25권3호
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• pp.38.1-38.16
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• 2024

Importance: Deaths due to neonatal calf diarrhea are still one of the most critical problems of cattle breeding worldwide. Determining the parameters that can predict diarrhea-related deaths in calves is especially important in terms of prognosis and treatment strategies for the disease. Objective: The primary purpose of this study was to determine mortality rates and durations, survival status, and predictive prognosis parameters based on vital signs, hematology, and blood gas analyses in neonatal diarrheic calves. Methods: The hospital automation system retrospectively obtained data from 89 neonatal diarrheic calves. Results: It was found that 42.7% (38/89) of the calves brought with the complaint of diarrhea died during hospitalization or after discharge. Short-term and long-term fatalities were a median of 9.25 hours and a median of 51.50 hours, respectively. When the data obtained from this study is evaluated, body temperature (℃), pH, base excess (mmol/L), and sodium bicarbonate (mmol/L) parameters were found to be lower, and hemoglobin (g/dL), hematocrit (%), lactate (mmol/L), chloride (mmol/L), sodium (mmol/L) and anion gap (mmol/L) parameters were found to be higher in dead calves compared to survivors. Accordingly, hypothermia, metabolic acidosis, and dehydration findings were seen as clinical conditions that should be considered. Logistic regression analysis showed that lactate (odds ratio, 1.429) and CI^- (odds ratio, 1.232) concentration were significant risk factors associated with death in calves with diarrhea. Conclusions and Relevance: According to the findings obtained from this study, the determination of lactate and Cl^- levels can be used as an adjunctive supplementary test in distinguishing calves with diarrhea with a good prognosis.

• 한국수학교육학회지시리즈A:수학교육
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• 제63권2호
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• pp.273-294
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• 2024

최근 교육 분야에서의 '에듀테크'에 대한 관심이 커짐에 따라, 교사와 학생 모두 이러한 변화에 적응하고 있으며, 에듀테크는 이제 학교에서 자연스럽게 활용되어가고 있는 추세이다. 특히 에듀테크를 사용한 다양한 교수·학습 전략을 통해 교육격차를 줄이는 것에도 많은 관심이 쏠리고 있는바, 교육격차를 줄이는 다양한 방법 중 본 연구는 학생들의 자기주도적 과제 관리의 중요성에 주목하여 교사가 필요한 과제를 학생들에게 제공하고 관리할 수 있는 수학학습 플랫폼을 개발, 적용하고자 하였다. 본 연구에서 개발한 '수쌤' 플랫폼은 공교육에서 활용 가능한 교사 주도 과제 관리 시스템으로서, 교사들이 학생들에게 필요한 문제를 제시하면 학생들은 자신의 문제해결 과정을 점검하며 성장을 스스로 모니터링하는 과정을 통해 문제해결 능력을 향상시키고자 하는 목적을 지녔다. 본 고를 통해 '수쌤'을 활용하여 학생들은 자신의 수준에 맞는 과제를 해결함으로써 문제해결 능력을 향상시켜 나가는 사례를 보여주고자 하였으며 더 나아가 디지털 교육 환경에서의 교사 역할의 중요성도 제안하였다.

• Asia pacific journal of information systems
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• 제29권2호
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• pp.308-327
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• 2019

The concept of sharing economy has received rich attention in recent years. As a typical type of business model in the sharing economy, online short rent has been paid attention by both industry and academia. In this study, we find trust to be a critical determinant to the success of online short rent platforms. Based on three dimensions of trust theory, i.e., ability, benevolence and integrity, we investigate the factors influencing tenant' willingness to participate in online short rent. We further examine the extent to which trust can influence the number of sales and comments of rooms listed at online short-term rent platforms, which can represent tenant' willingness to participate in the sharing economy. The results show that the trust dimensions represented by a landlord's personal characteristics have significant positive correlations with the number of sales and comments. For example, the real name authentication and the sesame score can represent the trust integrity; online replay ratio and the average confirmation time representing the trust sincerity, and the order acceptance ratio representing the trust ability. On this basis, we proposed some recommendations for both platforms and landlords. For example, the landlords can improve the tenants' trust by authenticating his/her real name, replying actively and timely. For platforms, when they make housing list ranking rules, they can take the landlord's personal attributes that may affect trust into consideration. Moreover, platforms can also allow landlords to supply value-added services to improve service quality and ultimately promote the virtuous circle of the platform ecosphere. Through conducting the empirical research on a particular application of the sharing economy, we aim to fill the research gap of this field in China and provide theoretical and practical contributions to the future development of online short rent.

• Ocean Systems Engineering
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• 제14권2호
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• pp.171-210
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• 2024

This paper focuses on the rigorous and holistic fatigue analysis of mooring chains for a deep draft semi-submersible platform in the challenging environment of the central Gulf of Mexico (GoM). Known for severe hurricanes and strong loop/eddy currents, this region significantly impacts offshore structures and their mooring systems, necessitating robust designs capable of withstanding extreme wind, wave and current conditions. Wave scatter and current bin diagrams are utilized to assess the probabilistic distribution of waves and currents, crucial for calculating mooring chain fatigue. The study evaluates the effects of Vortex Induced Motion (VIM), Out-of-Plane-Bending (OPB), and In-Plane-Bending (IPB) on mooring fatigue, alongside extreme single events such as 100-year hurricanes and loop/eddy currents including ramp-up and ramp-down phases, to ensure resilient mooring design. A detailed case study of a deep draft semi-submersible platform with 16 semi-taut moorings in 2,500 meters of water depth in the central GoM provides insights into the relative contributions of wave scatter diagram, VIMs from current bin diagram, the combined stresses of OPB/IPB/TT and extreme single events. By comparing these factors, the study aims to enhance understanding and optimize mooring system design for safety, reliability, and cost-effectiveness in offshore operations within the central GoM. The paper addresses a research gap by proposing a holistic approach that integrates findings from various contributions to advance current practices in mooring design. It presents a comprehensive framework for fatigue analysis and design optimization of mooring systems in the central GoM, emphasizing the critical importance of considering environmental conditions, OPB/IPB moments, and extreme single events to ensure the safety and reliability of mooring systems for offshore platforms.